Use List instead of Link in the type system.

sdk/lib/_internal/compiler/implementation/js_backend/constant_system_javascript.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of js_backend;
 
 const JAVA_SCRIPT_CONSTANT_SYSTEM = const JavaScriptConstantSystem();
 
 class JavaScriptBitNotOperation extends BitNotOperation {
   const JavaScriptBitNotOperation();
@@ skipping 249 matching lines @@
         protoValue = null;
         break;
       }
     }
 
     bool hasProtoKey = (protoValue != null);
     DartType keysType;
     if (sourceType.treatAsRaw) {
       keysType = compiler.listClass.rawType;
     } else {
-      Link<DartType> arguments =
-          new Link<DartType>.fromList([sourceType.typeArguments.head]);
+      List<DartType> arguments = <DartType>[sourceType.typeArguments.first];
       keysType = new InterfaceType(compiler.listClass, arguments);
     }
     ListConstant keysList = new ListConstant(keysType, keys);
     String className = onlyStringKeys
         ? (hasProtoKey ? JavaScriptMapConstant.DART_PROTO_CLASS
                        : JavaScriptMapConstant.DART_STRING_CLASS)
         : JavaScriptMapConstant.DART_GENERAL_CLASS;
     ClassElement classElement = backend.jsHelperLibrary.find(className);
     classElement.ensureResolved(compiler);
-    Link<DartType> typeArgument = sourceType.typeArguments;
+    List<DartType> typeArgument = sourceType.typeArguments;
     InterfaceType type;
     if (sourceType.treatAsRaw) {
       type = classElement.rawType;
     } else {
       type = new InterfaceType(classElement, typeArgument);
     }
     return new JavaScriptMapConstant(
         type, keysList, values, protoValue, onlyStringKeys);
 
   }
@@ skipping 41 matching lines @@
       result.add(keyList);
     } else {
       // Add the keys individually to avoid generating an unused list constant
       // for the keys.
       result.addAll(keys);
     }
     result.addAll(values);
     return result;
   }
 }